Armature.



J. OOATES.

ARMATURE.

APPLIUATION FILED MAR. 27, 1907.

Patented May 30, 1911.

Inventor Jesse Coates,

b fitt'y.

THE "cums PETER; cm, WASHINGTDN, n. c.

UNITED STTS A .EN

FMSCE.

JESSE COATES, OF LYNN, MASSACHUSETTS, ASSIGNOB. TO GENERAL ELECTRIC COM-PANY, A CORPORATION OF NEW YORK.

ARMATURE.

Application filed March 27, 1907. Serial No. 364,808.

To all whom it may concern:

Be it known that I, Jnssn CoA'rns, a citizen of the United States,residing at Lynn, county of Essex, State of Massachusetts, have inventedcertain new and useful Improvements in Armatures, of which the followingis a specification.

My invention relates to small light armatures, such as are employed inthe motors of electric motors of the commutator type, and my inventionconsists in an improvement in the armature construction described inPatent No. 825,252, issued to F. M. Vogel, July 3, 1906. In that patentis described a vertical armature comprising a light shell of paper orother moldable material for supporting the armature coils, which arespaced apart by integral projections on the shell. In armatures of thistype, the coils cross at the ends of the armature at an acute angle, andit has been found in practice that there is a tendency for a coil toslip on the coil immediately below it at the point of intersection; andsince the wires of the coil are small, this slipping tends to cut theinsulation and to produce a shortcircuit.

My invention consists in so shaping the supporting shell that each coilis raised above the coil immediately below at the point of intersection,so that injury to the insulation, due to slipping, is prevented.

My invention will best be understood by reference to the accompanyingdrawing, in which Figure 1 is a plan view of the armatureshell; Fig. 2shows an elevation of the same, partly broken away, showing the methodof securing the shell to the supporting shaft; Fig. 3 shows an elevationof a complete armature; and Fig. 4: shows a view lookin downward fromthe top of the armature if it be cut on the line bb of Fig. 2.

In the drawing A. represents the armature-shell which, for conveniencein manufacture, is mold-ed in two approximately hemispherical parts ofpaper or other 1nold able material, the edges of which may be joined byshellac. The shell is slightly flattened at its ends where the coils Bcross, in order that the finished armature may be approximatelyspherical in shape, as shown in Fig. 3. The shell is provided withintegral projections, formed in molding the shell, for spacing thecoils, substantially as shown in the patent to Vogel, above mentioned,and is, in addition, provided with raised portions, as is most clearlyshown in Fig. 1 and Fig. 4. These raised portions are for the purpose ofraising each coil above the coil immediately below it at the point wherethe two coils cross, so as to remove any tendency of the upper coil toslip on the lower coil. That the arrangement of raised portions shown inFig. 1 and Fig. 4 is adapted to produce the desired result, will beobvious from the drawings, when the order of winding the coils isconsidered. The first coil is wound in the spaces that are marked 1 1 inFig. 1 and Fig. 1, one half the coil passing on each side of the shaft,and the second coil in the spaces marked 2 2. The points where thesecond coil intersects with the first, and the coil is raised above thefirst coil on account of the configuration of the armature body areindicated at 3 in Figs. 1 and 4E. The third coil is wound in the spaces1 4 intersecting the second coil at points 5, at which points it israised above the second coil. The fourth and last coil is wound in thespaces 6 6 intersecting the third coil at points 7, and the first coilat points 8. At both of these points it is raised above the coilsimmediately below it. Thus, each coil is raised above the coilimmediately below it at their crossing point, so that all slipping ofone coil on the other is avoided.

I do not desire to limit myself to the particular construction andarrangements of parts here shown, but aim in the appended claims tocover all modifications which are within the scope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is

1. An armature of substantially spherical shape comprising a pluralityof coils crossing at the ends of the armature at an acute angle and asupporting shell for the coils having raised portions adapted to raise acoil above the coil immediately below it at the crossing point of thecoils.

2. An armature of a substantially spherical shape comprising a pluralityof coils crossing at the ends of the armature at an acute angle and athin supporting shell for the coils formed of moldable material andhaving portions adapted to raise a coil above the coil immediately belowit at the crossing'point of the coils.

Patented May 30, 1911' 8. A spherical armature comprising coils crossingat the ends of the armature, and a supporting shell for the coils formedof two approximately hemispherical parts having raised portions adaptedto raise a coil above the coil immediately below it at the crossingpoint of the coils.

In witness whereof, I have hereunto set my hand this twentieth day ofMarch, 1907.

JESSE COATES.

Witnesses JOHN A. Mcll Lmos, Jr., HENRY O. VVESTENDARP.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

